A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Rooftop airport cushions "copter" landings
Roof of post office in Los Angeles, Calif, being built as landing field for helicopters; roof consists of 1 3/4 in. insulation board, 9 in. slab of concrete, five-ply asphalt waterproof membrane, 1 1/2 in. of fine beach sand, covered with copper sheetings, lightweight concrete and 1 1/2 in. layer of smooth concrete topping.
Rooftop airport cushions "copter" landings
Roof of post office in Los Angeles, Calif, being built as landing field for helicopters; roof consists of 1 3/4 in. insulation board, 9 in. slab of concrete, five-ply asphalt waterproof membrane, 1 1/2 in. of fine beach sand, covered with copper sheetings, lightweight concrete and 1 1/2 in. layer of smooth concrete topping.
Rooftop airport cushions "copter" landings
Eng News-Rec
Engineering News-Record ; 145
1950
Article (Journal)
English
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